Two-stage pump



FIG. 1 is a perspective view of a two-stage pump showing our new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is an elevational view of the opposite side thereof;

FIG. 4 is an end elevational view thereof;

FIG. 5 is an elevational view of the opposite end thereof;

FIG. 6 is a top plan view thereof; and

FIG. 7 is a bottom plan view thereof. 

The ornamental design for a two-stage pump, as shown. 